# John Martin Klassen

> researcher

**Wikidata**: [Q64865344](https://www.wikidata.org/wiki/Q64865344)  
**Source**: https://4ort.xyz/entity/john-martin-klassen


## References

1. IdRef
2. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
3. Czech National Authority Database
4. Bibliography of the History of the Czech Lands